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Generic DNS Tools
https://www.domaintools.com/ (5) Partly free
http://www.dnsstuff.com/ (3) Free
http://mxtoolbox.com/SuperTool.aspx (5) Free
http://dnstools.com/ (2) Free
http://www.kloth.net/
https://www.dnswatch.info/
http://www.dnsqueries.com/en/
http://dnsdigger.com/
http://digwebinterface.com/
WhoIs Tools
http://lantricks.com/
http://www.tialsoft.com/
http://networkmost.com/
http://johnru.com/
http://www.callerippro.com/ (?) Not Free
http://nirsoft.net/
http://sobolsoft.com/
http://www.softfuse.com/
http://www.whoisanalyzer.com/
http://centralops.net/co/
https://tools.whois.net/
http://betterwhois.com/
http://whois.online-domain-tools.com/
https://www.networksolutions.com/
https://network-tools.webwiz.net/whois-lookup.htm
http://www.webtoolhub.com/tn561381-whois-lookup.aspx
http://network-tools.com/
https://www.ultratools.com/whois
Traceroute Tools
http://www.networkpinger.com/en/
http://oreware.com/
https://www.net.princeton.edu/
Other Tools
http://netscantools.com/
http://blueinfy.com/
https://www.robtex.com/
IP Range Intelligence
https://www.iana.org/
http://www.afrinic.net/ (Africa Region)
https://www.apnic.net/ (Asia/Pacific Region)
https://www.arin.net/ (Canada, USA, and some Caribbean Islands)
http://www.lacnic.net/ (Latin America and some Caribbean Islands)
https://www.ripe.net/ (Europe, the Middle East, and Central Asia)
https://www.domaintools.com/ (5) Partly free
http://www.dnsstuff.com/ (3) Free
http://mxtoolbox.com/SuperTool.aspx (5) Free
http://dnstools.com/ (2) Free
http://www.kloth.net/
https://www.dnswatch.info/
http://www.dnsqueries.com/en/
http://dnsdigger.com/
http://digwebinterface.com/
WhoIs Tools
http://lantricks.com/
http://www.tialsoft.com/
http://networkmost.com/
http://johnru.com/
http://www.callerippro.com/ (?) Not Free
http://nirsoft.net/
http://sobolsoft.com/
http://www.softfuse.com/
http://www.whoisanalyzer.com/
http://centralops.net/co/
https://tools.whois.net/
http://betterwhois.com/
http://whois.online-domain-tools.com/
https://www.networksolutions.com/
https://network-tools.webwiz.net/whois-lookup.htm
http://www.webtoolhub.com/tn561381-whois-lookup.aspx
http://network-tools.com/
https://www.ultratools.com/whois
Traceroute Tools
http://www.networkpinger.com/en/
http://oreware.com/
https://www.net.princeton.edu/
Other Tools
http://netscantools.com/
http://blueinfy.com/
https://www.robtex.com/
IP Range Intelligence
https://www.iana.org/
http://www.afrinic.net/ (Africa Region)
https://www.apnic.net/ (Asia/Pacific Region)
https://www.arin.net/ (Canada, USA, and some Caribbean Islands)
http://www.lacnic.net/ (Latin America and some Caribbean Islands)
https://www.ripe.net/ (Europe, the Middle East, and Central Asia)